Nativist!

"Nativist" is one of many terms used almost exclusively as a pejorative in contemporary American media disourse, but unlike "anti-Semite", "warmonger", "isolationist", and others of the conversation-chilling ilk, I suspect that while few people would self-describe as being hostile towards Semites, trying to precipitate war, or isolating one's country from the rest of the world, a solid majority of the public is favorably inclined towards definitional nativism. The dictionary definition of nativism:

A policy of favoring native inhabitants as opposed to [favoring] immigrants.

My polemical advice to those labelled as nativists is for them to respond to such "attacks" by merely describing what the term means and and let it stand for itself at that.